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mmc: sdhci-of-esdhc: avoid writing power control register 

The eSDHC doesn't have a standard power control register, so when
writing this register in stack we should do nothing to avoid
incorrect operation.

Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
yangbo lu 2015-10-16 15:44:03 +08:00 committed by Ulf Hansson
parent a599579ee8
commit 9e4703df3a
1 changed files with 6 additions and 0 deletions
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6
drivers/mmc/host/sdhci-of-esdhc.c
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@ -182,6 +182,12 @@ static u32 esdhc_writeb_fixup(struct sdhci_host *host,
u8 tmp;
int shift = (spec_reg & 0x3) * 8;
/*
* eSDHC doesn't have a standard power control register, so we do
* nothing here to avoid incorrect operation.
*/
if (spec_reg == SDHCI_POWER_CONTROL)
return old_value;
/*
* "DMA select" location is offset 0x28 in SD specification, but on
* P5020 or P3041, it's located at 0x29.